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PCI: qcom: Remove DPC Extended Capability

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Some platforms (e.g., X1E80100) expose Downstream Port Containment (DPC)
Extended Capability registers in the PCIe Root Port config space, but do
not fully support it. To prevent undefined behavior and ensure DPC cap is
not visible to PCI framework and users, remove DPC Extended Capability
unconditionally, since there is no Qcom platform support DPC till now.

Co-developed-by: Wenbin Yao <wenbin.yao@oss.qualcomm.com>
Signed-off-by: Wenbin Yao <wenbin.yao@oss.qualcomm.com>
Signed-off-by: Qiang Yu <qiang.yu@oss.qualcomm.com>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Link: https://patch.msgid.link/20251109-remove_cap-v1-5-2208f46f4dc2@oss.qualcomm.com
This commit is contained in:
Qiang Yu 2025-11-09 22:59:44 -08:00 committed by Manivannan Sadhasivam
parent 7c29cd0fdc
commit 6a13949909
1 changed files with 1 additions and 0 deletions
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1
drivers/pci/controller/dwc/pcie-qcom.c
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@ -1317,6 +1317,7 @@ static int qcom_pcie_host_init(struct dw_pcie_rp *pp)
}
dw_pcie_remove_capability(pcie->pci, PCI_CAP_ID_MSIX);
dw_pcie_remove_ext_capability(pcie->pci, PCI_EXT_CAP_ID_DPC);
qcom_ep_reset_deassert(pcie);